I should clarify that When I mentioned posts about 1 leaf sitting and doing nothing it was a leaf or two on the vine , not those funny hearts (just 1 rooted leaf no vine ) that root and never grow a vine (plenty of posts about them too)…and they never will unless there is a tiny leaf node with vine, just like Daisy said.
However, I rootinely root multi leaf cuttings and preserve most leaves by enclosing it in plastic tent a la terrarium.
I just rooted 2 crotons with a dozen huge leaves each and 3 huge branches of Dipladenia with18" branches at least.
So it depends on which plant we are talking about, of course, and how you root.
But I Never cut my leaves to just 2-3 at the top and they root perfectly fine and growth is much faster when you have a good amount of leaves right away.
The exception are woody shrubs with semi-hardwood stems: since those might take 2-3 months to root they say cut off the leaves. I don't do that either 😏: and they root , but drop some leaves eventually. But that's ok with me, I am still ahead of the game by having a decent looking small plant from the beginning.
But …Hoya kerii is what this thread is about, not other plants. And that is quite specific: it is a very slow grower when starting from a small cutting . It roots quite fast, that is not a problem , but the new vine will take a long time, so I think it is much better to have 3 leaves vs 1.
